North America Native Plant

False Watermeal

Botanical name: Uncinia brevicaulis

USDA symbol: UNBR

Life cycle: perennial

Habit: grass

Native status: Native to Hawaii  

False Watermeal: A Native Hawaiian Sedge Worth Knowing If you’ve ever wandered through Hawaii’s natural landscapes and noticed delicate, grass-like plants dotting the terrain, you might have encountered false watermeal (Uncinia brevicaulis). This charming native Hawaiian sedge belongs to a fascinating group of plants that often get mistaken for grasses ...

False Watermeal: A Native Hawaiian Sedge Worth Knowing

If you’ve ever wandered through Hawaii’s natural landscapes and noticed delicate, grass-like plants dotting the terrain, you might have encountered false watermeal (Uncinia brevicaulis). This charming native Hawaiian sedge belongs to a fascinating group of plants that often get mistaken for grasses but have their own unique personality and ecological importance.

What is False Watermeal?

False watermeal is a perennial sedge that’s part of the diverse family of grass-like plants, which includes sedges, rushes, and true grasses. Don’t let the name fool you – despite being called false watermeal, this plant is actually a member of the sedge family (Cyperaceae) rather than being related to watermeal plants. Like many common plant names, this one can be a bit misleading!

As a native Hawaiian species, Uncinia brevicaulis has adapted specifically to the unique climate and growing conditions found across the Hawaiian Islands. This makes it an excellent choice for gardeners looking to create authentic Hawaiian landscapes or support local ecosystems.

Where Does False Watermeal Grow?

False watermeal is endemic to Hawaii, meaning you won’t find it growing naturally anywhere else in the world. This special plant calls only the Hawaiian Islands home, making it a true treasure of Hawaiian biodiversity.

Why Consider False Watermeal for Your Garden?

If you’re gardening in Hawaii, choosing native plants like false watermeal offers several compelling benefits:

  • Authentic Hawaiian landscaping: Nothing says Hawaiian garden like plants that actually belong there
  • Low maintenance: Native plants are naturally adapted to local conditions, typically requiring less water, fertilizer, and pest control
  • Ecosystem support: Native plants provide food and habitat for local wildlife that have evolved alongside them
  • Unique texture: Sedges add interesting textural contrast to garden designs with their grass-like appearance

The Growing Challenge

Here’s where things get a bit tricky – detailed cultivation information for false watermeal is quite limited in available resources. This isn’t uncommon with lesser-known native species, especially those with restricted ranges like Hawaiian endemics.

What we do know is that as a native Hawaiian sedge, it likely prefers conditions similar to other Hawaiian natives:

  • Well-draining soil (many Hawaiian plants don’t tolerate waterlogged conditions)
  • Moderate to bright light conditions
  • Protection from strong winds in exposed locations
  • Minimal fertilization once established

Finding and Growing False Watermeal

If you’re interested in growing false watermeal, your best bet is to:

  • Contact local Hawaiian native plant societies or botanical gardens
  • Check with native plant nurseries specializing in Hawaiian flora
  • Consult with local extension services or university botanical programs
  • Connect with other native plant enthusiasts who may have experience with Hawaiian sedges

Remember, when sourcing any native plant, especially one with limited distribution, it’s crucial to ensure you’re getting responsibly propagated material rather than plants collected from wild populations.

The Bigger Picture

While we may not have all the cultivation details figured out for false watermeal, growing native Hawaiian plants is always a worthwhile endeavor. These plants are part of Hawaii’s natural heritage and play important roles in local ecosystems that we’re still learning about.

Even if false watermeal proves challenging to grow or obtain, exploring native Hawaiian sedges and grasses can lead you to discover other wonderful native species that might be perfect for your landscape goals.

A Plant Worth Protecting

Whether or not false watermeal ends up in your garden, knowing about native species like this one helps us appreciate the incredible diversity of Hawaii’s natural world. Every endemic plant represents millions of years of evolution in these isolated Pacific islands, creating species found nowhere else on Earth.

By choosing native plants when possible and learning about species like false watermeal, gardeners become part of a larger conservation effort to preserve Hawaii’s unique botanical heritage for future generations.

False Watermeal

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Cyperaceae Juss. - Sedge family

Genus

Uncinia Pers. - birdcatching sedge

Species

Uncinia brevicaulis Thouars - false watermeal

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA